Data collection will be performed by the operating surgeon or a designated member of the surgical team (present at time of operation) and recorded on an electronic pro-forma or electronic Case Report Form. It will include patient demographics (age, sex), previous diverticular history American Society of Anaesthesiologists (ASA) grade and specific co-morbidities, intervention performed, operation performed, incidence of stoma formation, re-intervention during index admission (radiological or operative) in-hospital morbidity (myocardial infarction, deep vein thrombosis, pulmonary embolism, wound infection, abscess requiring drainage, urosepsis, renal failure or respiratory insufficiency), mortality, time to return to diet, time to discharge. Further details will be recorded at post-operative visits- stoma-free survival at one year, number of days alive following discharge, reinterventions within 12 months, patient satisfaction.